Douglas Downing Books

More than 600 definitions of terms used in algebra, geometry, analytic geometry, trigonometry, probability, statistics, logic, computer math, and calculus.

Statistics, the easy way

By Douglas Downing

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Calculus the easy way

By Douglas Downing

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Trigonometry the easy way

By Douglas Downing

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Explains the principles of trigonometry and includes practice exercises with answers.

Algebra, the easy way

By Douglas Downing

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.